[Android] BackgroundColor for GraphicsView

Author: kubaflo

src/Controls/tests/TestCases.Android.Tests/snapshots/android/GraphicsViewShouldHaveBackgroundColor.png

@@ -0,0 +1,47 @@
+namespace Maui.Controls.Sample.Issues
+{
+
+	[Issue(IssueTracker.Github, 19568, "GraphicsView does not change the Background/BackgroundColor on Android", PlatformAffected.Android)]
+	public class Issue19568 : ContentPage
+	{
+		public Issue19568()
+		{
+			var graphicsView = new GraphicsView()
+			{
+				HeightRequest = 300,
+				WidthRequest = 300,
+				AutomationId = "graphicsView",
+				BackgroundColor = Colors.Red,
+				Drawable = new MyDrawable()
+			};
+
+			Content =
+				new VerticalStackLayout()
+				{
+					new Grid
+					{
+						Children = {
+							new Label() { Text = "The GraphicsView should have a blue background color" },
+							graphicsView
+						}
+					},
+					new Button
+					{
+						Text = "Change BackgroundColor & opacity",
+						AutomationId = "ChangeBackgroundColorButton",
+						Command = new Command(() =>
+						{
+							graphicsView.BackgroundColor = Colors.Blue;
+							graphicsView.Opacity = 0.1;
+						})
+					}
+				};
+		}
+
+		class MyDrawable : IDrawable
+		{
+			public void Draw(ICanvas canvas, RectF dirtyRect) { }
+		}
+	}
+}
+

src/Controls/tests/TestCases.HostApp/Issues/Issue19568.cs

@@ -0,0 +1,26 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue19568 : _IssuesUITest
+	{
+		const string Success = "Success";
+
+		public Issue19568(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "GraphicsView does not change the Background/BackgroundColor on Android";
+
+		[Test]
+		[Category(UITestCategories.GraphicsView)]
+		public void GraphicsViewShouldHaveBackgroundColor()
+		{
+			App.WaitForElement("ChangeBackgroundColorButton");
+			App.Click("ChangeBackgroundColorButton");
+			VerifyScreenshot();
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue19568.cs

@@ -1,4 +1,5 @@
-using Microsoft.Maui.Graphics.Platform;
+using Microsoft.Maui.Graphics;
+using Microsoft.Maui.Graphics.Platform;
 
 namespace Microsoft.Maui.Handlers
 {
@@ -11,6 +12,7 @@ internal static void MapBackground(IGraphicsViewHandler handler, IGraphicsView g
 		{
 			if (graphicsView.Background is not null)
 			{
+				handler.PlatformView?.UpdateBackground(graphicsView);
 				handler.PlatformView?.Invalidate();
 			}
 		}

src/Controls/tests/TestCases.iOS.Tests/snapshots/ios/GraphicsViewShouldHaveBackgroundColor.png

@@ -1,4 +1,5 @@
-using Microsoft.Maui.Graphics.Platform;
+using Microsoft.Maui.Graphics;
+using Microsoft.Maui.Graphics.Platform;
 
 namespace Microsoft.Maui.Platform
 {
@@ -8,5 +9,10 @@ public static void UpdateDrawable(this PlatformGraphicsView PlatformGraphicsView
 		{
 			PlatformGraphicsView.Drawable = graphicsView.Drawable;
 		}
+
+		internal static void UpdateBackground(this PlatformGraphicsView PlatformGraphicsView, IGraphicsView graphicsView)
+		{
+			PlatformGraphicsView.BackgroundColor = graphicsView.Background?.ToColor();
+		}
 	}
 }